He moved north to coastal North Yarmouth, Maine (now Yarmouth), where he established a pottery business on Gooches' Lane (today's East Elm Street).
[1][2][3] In 1804, he married Rebecca Swasey,[4] with whom he had twelve known children,[5] including daughters Diantha Heald (in 1809)[6] and Mary (1807).
[7] Foster helped lay out the adjacent Baker Street around 1848.
He is interred in Yarmouth's Old Baptist Cemetery, alongside his wife, who survived him by 22 years.
[5] Foster's sons, Benjamin and William, who were his assistants, ran the pottery after their father's death.